/**
 * Copyright 2009 Emory University
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated  documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the 
 * Software is furnished to do so, subject to the following conditions: The 
 * above copyright notice and this permission notice shall be included in all 
 * copies or substantial portions of the Software. 
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
package com.markgrand.structuredSql;

/**
 * Append a FROM item to a StringBuilder.
 * 
 * @author Mark Grand
 */
class FromItem private (val item:SQLAppender, 
                                val alias:String) extends SQLAppender with SQLIdentifier {
  
  /**
   * Append the name of a table.  If an alias was specified, append that too.
   */
  def append(builder:StringBuilder) {
    item.append(builder)
    if (alias != null) {
      builder.append(" ")
      appendIdentifier(alias, builder)
    }
  }
}

object FromItem {
  def apply(tableName:String) = new FromItem(TableName(tableName), null)
  def apply(tableName:String, alias:String) = new FromItem(TableName(tableName), alias)
  def apply(schemaName:String, tableName:String, alias:String) = new FromItem(TableName(schemaName, tableName), alias)
  def apply(table:TableName) = new FromItem(table, null)
  def apply(table:TableName, alias:String) = new FromItem(table, alias)
  def apply(item:SQLAppender, alias:String) = new FromItem(item, alias)
}
